DB 255
This telephone has a dial and can only be used on Telephone Systems OL 20 and OL 25.

Parts
Microphone RE 1023 with cord RS 6141 wall mount cable RS 5212 with 3-part plug and wall mount. The microphone is equipped with a high resistance insulated capsule.
Dial RG 100.
Ringer of 300ohm resistance.
Push button for issuing a signal.
Case of black lacquered iron sheet.

Connection terminals are covered.

The dial number plate is numbered 1, 2  to 9, 0, in a clockwise direction.

Weight: 2.9 kg.

On request, at an increased price, we deliver these devices with a central connection in a microphone box.

DB 256
The same device as the DB 255 but with a fixed wall mount without a plug.

Note that the dial is numbered 1, 2 to 9, 0 in a clockwise direction.
 

Taken from the L. M. Ericsson Telephones and Signalling Material Catalogue No. 122 (1930) - Swedish Translation

Last revised: July 23, 2025